OR 



L? 



TR 



FlG. 28. A 40-MM. TADPOLE DISSECTED FROM THE VENTRAL 

 SURFACE TO SHOW THE HEART, THE BRANCHIAL VESSELS, AND THE 

 HEAD-KIDNEYS AND WOLFFIAN BODIES. THE TAIL HAS BEEN CUT 



OFF. X 5. (After Marshall.) 



A, dorsal aorta. A F.\, A F.3, afferent branchial vessels of first and third 

 branchial arches. A L, lingual artery. C G, carotid gland. EF.l, E F.3, effer- 

 ent branchial vessels of first and third branchial arches. F, fat body. G M, 

 glomerulus. K A, archinephric or segmental duct. K M t Wolffian body. KP, 

 pronephros or head-kidney, now degenerating. LA, fore-limb, still within oper- 

 cular cavity. L /, upper lip. LJ, lower lip. L /*, hind-limb. OR, genital 

 ridge. R 7\ truncus arteriosus. R V, ventricle. T C, cloaca. TO, oesophagus, 

 cut short. TR, cloacal spout. 



7 6 



